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Mapping cell type-specific transcriptional enhancers using high affinity, lineage-specific Ep300 bioChIP-seq
Pingzhu Zhou1, Fei Gu1, Lina Zhang2
1Department of Cardiology, Boston Children's Hospital, Boston, United States.
Elife
|January 26, 2017
Summary
Researchers developed a new method to map gene regulatory elements called enhancers in mice. This technique uses protein biotinylation to identify enhancers active in specific cell types, advancing our understanding of cell specialization.
Area of Science:
- Genomics
- Molecular Biology
- Developmental Biology
Background:
- Understanding cell type-specific gene regulation is crucial for deciphering biological complexity.
- Genomic regulatory elements, such as transcriptional enhancers, play a key role in controlling gene expression.
- Identifying these elements in a lineage-specific manner is essential for understanding cell differentiation and function.
Purpose of the Study:
- To develop and validate a lineage-selective method for mapping transcriptional enhancers in mice.
- To identify novel enhancers active in specific embryonic and adult cell lineages.
- To discover new transcription factor binding motifs regulating cell-type-specific gene expression.
Main Methods:
- Developed a Cre-directed, lineage-specific Ep300 biotinylation and pulldown strategy.
- Utilized immobilized streptavidin to capture biotinylated Ep300 and associated DNA.
- Employed next-generation sequencing to identify lineage-specific enhancers in embryonic endothelial/blood and skeletal muscle cells.
- Applied the method to identify enhancers in adult heart and lung endothelial cells.
Main Results:
- Successfully mapped lineage-specific enhancers active in embryonic endothelial/blood and skeletal muscle.
- Identified novel transcription factor heterodimer motifs potentially regulating transcription in these lineages.
- Discovered candidate enhancers involved in adult heart- and lung-specific endothelial cell specialization.
- Demonstrated the utility of tissue-specific protein biotinylation for studying lineage-specific interactions.
Conclusions:
- The developed lineage-selective protein biotinylation method is effective for mapping transcriptional enhancers.
- This approach provides new insights into the regulatory mechanisms governing cell type-specific gene expression.
- The findings open new avenues for investigating lineage-specific protein-DNA and protein-protein interactions in developmental and disease contexts.
